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Ampeg V4 restoration

Mine was missing that plate too. I simply measured where the lid goes, took those measurements to an auto body shop where they cut me a rectangle out of 18 ga sheet metal. I then placed the raw lid on the chasis and marked the screw holes, then drilled them. Fliptops has the right screws.
 
The original plate has a little locking mechanism that clamps down on the springs in the reverb tank. That whole setup would be extremely hard to mimic, I believe, unless one has a decent ability to fab small parts. IMHO that mechanism is not truly necessary...so fab a sheet metal top to fit as ddbassGA writes, and pop rivet the reverb tank on it.
 
There are lots of images [Invalid or Expired Link Removed] at ampegV4.com.

The mounting screws can also be found at hardware stores. The specs are available here: sheet metal screws, unslotted, hex head, #6, 3/8" length

Here is what the installed lid should look like:
v4_schemo2_05.jpg